LB3D - A Dense Urban Seismic Network
in Long Beach, CA

In 2011 and 2012, unusual seismic surveys were done in urban Long Beach, Ca. Their purpose
was to better define the Long Beach oilfield. The survey was done by
NodalSeismic on behalf of Signal Hill Petroleum.

The first phase of the survey occurred in 2011 and consisted of approximately 5300 sensors that recorded
continuously for 6 months. The second phase in 2012, used aproximately 2500 sensors to extend the
original survey to east, and recorded continuously for 3 months.

Under agreement with Signal Hill Petroleum, these data were made available to Caltech for research
on seismic processing and the seismic hazard in the Los Angeles Basin. We have online large
portions of the first phase of the survey and all of the second phase.
We thank Signal Hill Petroleum for permission to use their data in our research.